{"instruction": "You are an expert in relationship extraction. Please extract relationship triples that match the schema definition from the input. Return an empty list for relationships that do not exist. Please respond in the format of a JSON string.", "schema": ["place of birth", "place of death", "education institution"], "input": "As an undergraduate David Henige attended the University of Wisconsin of Toledo, Ohio in the 1960s, obtaining first a B.A. then a Master's degree in history. In 1967 he enrolled for postgraduate studies at UW-- Madison, completing a PhD in African History in 1973. Fieldwork towards his degree was undertaken in Ghana, West Africa. Henige's long association with the Memorial Library began during his PhD studies, where part of his time was spent working for the library."}
{"place of birth": [], "place of death": [], "education institution": [{"subject": "David Henige", "object": "University of Wisconsin"}]}